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If the problem is sporadic, it is surely something to do with the network connection between you and New York Internet.
If it is a hard error, it might be worth contacting support. Just maybe there is some incompatibility between Android through your ISP and FastMail. Before doing that, check the server name, user, passport, port umber and protocol. Remember that you must be using imap.fastmail.com/smtp.fastmail.com and an app password these days. For incoming, SSL/TLS and port 993. For outgoing, SSL/TLS and port 465.
It would not hurt to examine the Login Log also. Maybe, something there will trigger a thought about what may be going on.
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